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If the issuer does not default, which is, measured by historical standards, extremely unlikely for an A-rated company, an investor earns an incremental coupon income of 100 bp over a 1-year horizon. Conditional on the fact that the bond receives a downgrade to Baa during the course of the year, a price depreciation of 50 bp times the duration of the bond at the end of the year, that is approximately 3.5, would have to be expected. Since Baa-rated US corporate bonds on average traded at 150 bp over treasuries, 50 bp represents the spread widening that has to be expected as a consequence of the downgrade. Consequently the investor expects a negative excess return of 100 – 3.5x 50= -75 bp, if the rating is downgraded from A to Baa. Table 9.4 details the same computation for the other potential rating changes.
Evidence shows that a spread level of merely 25 bp was never achieved between 1989 and 2003 for Baa rated US corporate bonds. One reason is that from an economic perspective the default probabilities and recovery rates that were assumed to calculate the required spreads were too optimistic for this period. Especially between 1997 and 2002 the fundamental environment for corporate bonds was unfavorable. New technologies, company takeovers and equity buyback programs were primarily financed by the issuance of corporate bonds, resulting in an increased level of leverage in the corporate sector. Investors consequently required higher risk premia to invest in corporate bonds. One way to obtain more adequate estimates of required spreads is to use default probabilities and recovery rates that are typical for the current stage of the business cycle. Modern models for credit risk management and the pricing of credit derivatives account for the current economic environment. In particular, they differentiate between periods of expansion and contraction, because historically default rates increased and recovery rates fell during economic downturns, thus leading to a higher risk for credit investors. Additionally, a worst-case-scenario can be constructed assuming a zero per cent recovery value. A fair spread of 0.46 percent will be computed for Baa rated corporate bonds with a maturity of 5 years which is again a lot lower than the actually observed spreads.